<!doctype html><html lang="zh-Hans-CN"><head>	<meta charset="UTF-8">	<title>isNaN()函数的应用</title></head><body>    <h3>是否是非数值isNaN()的应用</h3>	<hr>	<script>		document.write("\"40\"是否是非数值:"+isNaN(40)+"<br>");		document.write("\"3*30\"是否是非数值:"+isNaN(3*30)+"<br>");		document.write("\"JavaScript\"是否是非数值:"+isNaN("JavaScript"));	</script>	<hr>    <p><script>document.write(document.lastModified);</script><a href="index.html">返回本章目录</a></p></body></html>